Maybe it's a bit similar to Dexter, but it can't be the same people. Completely different humor style.
Yeah, Dexter is more about Dexter solving (or failing to solve) the problems he encounters with his inventions with hilarious consequences, Johnny Test is pure undiluted NOISE starring an obnoxious Pre-Teen as he irritates everybody around him but saves the day.
The only similarities are the Laboratories and the Smart Sibling/Dumb Sibling mechanic, though gender reversed (and the smart is split into two for JT). Hell, the lab isn't even a secret in JT. Its such a terrible show and I still can't believe its gotten 6 [tornado fang]ing seasons. Hopefully they'll come to their senses and stop showing Annoying Orange too, but we can't rely on idiot kids to not watch terrible overstimulating dreck.
My bad it was made by the same dude who made Ned's Declassifide School Survival Guide and Big Time Rush.
What? Ned's Declassified was actually pretty good, what the hell happened indeed.